FTP Backlinks - New or Old Method?

Was doing some research into tiering parasites for some longtail ranking, and came across a page that is occupying the #1 ranking for a reasonably competitive term. When I investigated it's backlinks, I found that the majority of them were coming from ftp:// sources.

I'd usually not pay much attention to these, but given the ranking that they're apparently achieving, I'm interested to know whether this is an old trick that I've missed, or something a little more recent that I'm not familiar with.

Yeah right the first link downloads some info.zip. and also all the links appears to be youtue video links but apparently some of them ranks well for the term.Still confused about how they got these links.Any one?

Some people have an FTP open to public on their server. You can scan for this and write a bot to upload html files automatically with your links. Never thought about doing this, but I'd imagine if done in bulk it could be effective.

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